mrbgems: standardize HAL header include patterns

changed from angle brackets to quotes for gem-local HAL headers
(task.h, io_hal.h, socket_hal.h), and removed relative path prefix
from task.h include. this follows the mrbgem build system convention
where gem/include/ is automatically added to the include path.

Co-authored-by: Claude <noreply@anthropic.com>

mrbgems/hal-posix-io/src/io_hal.c

@@ -8,7 +8,7 @@
 */
 
 #include <mruby.h>
-#include <io_hal.h>
+#include "io_hal.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>

mrbgems/hal-posix-socket/src/socket_hal.c

@@ -12,7 +12,7 @@
 #include <mruby/class.h>
 #include <mruby/error.h>
 #include <mruby/presym.h>
-#include <socket_hal.h>
+#include "socket_hal.h"
 
 #include <sys/types.h>
 #include <sys/socket.h>

mrbgems/hal-win-io/src/io_hal.c

@@ -8,7 +8,7 @@
 */
 
 #include <mruby.h>
-#include <io_hal.h>
+#include "io_hal.h"
 
 #include <windows.h>
 #include <io.h>

mrbgems/hal-win-socket/src/socket_hal.c

@@ -12,7 +12,7 @@
 #include <mruby/class.h>
 #include <mruby/error.h>
 #include <mruby/presym.h>
-#include <socket_hal.h>
+#include "socket_hal.h"
 
 #define _WIN32_WINNT 0x0501
 #include <winsock2.h>

mrbgems/mruby-io/src/file.c

@@ -10,7 +10,7 @@
 #include <mruby/ext/io.h>
 #include <mruby/error.h>
 #include <mruby/presym.h>
-#include <io_hal.h>
+#include "io_hal.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>

mrbgems/mruby-io/src/file_test.c

@@ -9,7 +9,7 @@
 #include <mruby/ext/io.h>
 #include <mruby/error.h>
 #include <mruby/presym.h>
-#include <io_hal.h>
+#include "io_hal.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>

mrbgems/mruby-io/src/io.c

@@ -13,7 +13,7 @@
 #include <mruby/error.h>
 #include <mruby/internal.h>
 #include <mruby/presym.h>
-#include <io_hal.h>
+#include "io_hal.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>

mrbgems/mruby-socket/src/socket.c

@@ -39,7 +39,7 @@
 #include <mruby/presym.h>
 
 #include <mruby/ext/io.h>
-#include <socket_hal.h>
+#include "socket_hal.h"
 
 /* Address family information for compact lookup table */
 typedef struct {

mrbgems/mruby-task/src/task.c

@@ -19,7 +19,7 @@
 #include <string.h>
 #include <stdint.h>
 #include <stdlib.h>
-#include "../include/task.h"
+#include "task.h"
 #include "task_hal.h"
 
 /*